New England Patriots' Tom Brady walks off the field after throwing an interception, during the first half of the NFL Super Bowl 51 football game against the Atlanta Falcons, Sunday, Feb. 5, 2017, in Houston. (AP Photo/Darron Cummings)

New England Patriots' Tom Brady walks off the field after throwing an interception, during the first half of the NFL Super Bowl 51 football game against the Atlanta Falcons, Sunday, Feb. 5, 2017, in Houston. (AP Photo/Darron Cummings)(Darron Cummings)

"I don't understand why that wasn't a bigger news story," Gladwell said on Simmons' podcast. "First of all, if he had a concussion last season it was never listed on the injury report. Secondly, if he had a concussion last season he didn't take a week off, did he? He played the next week, which is sort of surprising. But third, why isn't there a stronger drumbeat for him to retire? The issue, people say, 'oh, well his arm is still as good as it was or his overall conditioning (is good).'"

Gladwell continued: "It's not about the conditioning of his body below the neck. The question about him retiring is all about his brain. And if he is getting concussions at the age of 40 -- concussions -- and playing the next week, there are so many danger signs. I do not want to see Tom Brady at 55 drooling into a cup. But that is a real possibility if he continues to do this. And the very thing that makes him such a great player is the very thing that makes it impossible for him to stop, right? He cannot be the one...he's not going to say, 'I'm done.' The Patriots have got to sit down with him and say, 'This is bananas. You just had one of the greatest seasons ever. You should stop. We have a replacement for you. Go out on a high.'"

Bill Simmons then chimed in.

"So, I've talked to people about this," Simmons said. "Nobody who plays sports or close to people who play sports want to go on the record in any way shape or form on this because it's so controversial and such a hot topic right now. But the consensus seems to be that these guys will not say anything if it's a big game. The competitiveness overrides everything else. So Brady got a concussion in the Super Bowl and he goes over and does the screen thing. He knows how to kind of fake the signs. He tells them he's fine and he goes back in. And he's making that choice."

This was the second time that Simmons suggested Brady had suffered a concussion in the Super Bowl, and the second time he did so nonchalantly.

He transitioned to the topic by saying to Gladwell, "You were obsessed with this Brady and Gisele, this revelation that Gisele said in passing during this CBS interview that Brady had gotten a concussion in the Super Bowl."

Of course, Bundchen never said when the alleged concussion occurred. So either Simmons is confused or he knows something that has been kept a secret.

Brady chose to avoid speaking with reporters during the team's mandatory three-day minicamp in early June.

Listen to the podcast below. Simmons and Gladwell begin the Brady discussion at about the 55-minute mark.